Aerosol Extinction Contribution to Atmospheric Attenuation in Infrared Wavelengths

John A. Hodges

doi:10.1364/AO.11.002304

Applied Optics
Vol. 11,
Issue 10,
pp. 2304-2310
(1972)
•https://doi.org/10.1364/AO.11.002304

Aerosol Extinction Contribution to Atmospheric Attenuation in Infrared Wavelengths

John A. Hodges

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John A. Hodges, "Aerosol Extinction Contribution to Atmospheric Attenuation in Infrared Wavelengths," Appl. Opt. 11, 2304-2310 (1972)

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Abstract

Atmospheric attenuation in several good transmission windows is estimated for long sea-level paths using relatively unsophisticated techniques. The estimates consist of separate estimates of gas and water vapor absorption, aerosol extinction, and aerosol liquid absorption. The contribution of aerosol extinction and aerosol liquid absorption to total atmospheric attenuation is explored. Estimated spectral aerosol extinction and absorption coefficients between the wavelengths of 2 μm and 14 μm are plotted for a wide variety of relative humidities and aerosol nucleation particle distributions. Total attenuation estimates are compared to accepted field measurement data. The agreement is sufficiently good to provide a base for estimating infrared instrument performance under similar conditions.

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REF NO.	RANGE Km⁻¹	AIR TEMP. C	REL. HUM. %	pr. cm. H₂O	δ,2.17 km⁻¹	δ, 3.5 km⁻¹

1	5.5	1.4	47	1.37	—	—
2	5.5	3.3	66	2.2	0.091	0.062
3	5.5	17.8	51	4.18	0.042	0.031
4	5.5	25.3	73	9.4	—	—
5	16.25	11.7	41	5.2	—	—
6	16.25	20.6	53	15.1	0.038	0.038
7	16.25	23.3	82	27.7	0.046	0.047

REF NO.	TEMP °C	RELATIVE HUMIDITY %	RANGE, km	NUCLEATION DISTRIBUTION, $\frac{C}{C + M}$	SPECTRAL BANDLIMITS, MICROMETERS	Y&T MEASURED AVERAGE ATTEN %	ESTIMATED AVERAGE ATTEN %	$\frac{100 [E - (Y & T)]}{(Y & T)} %$
2	3.3	66	5.5	0.35	2.87–5.07	65.1	65.4	+0.4
					3.32–4.92	57.6	58.9	+ 2.3
					3.39–4.09	35.4	32.5	−8.2

3	17.8	51	5.5	0.60	2.87–5.07	63.0	64.5	+2.4
					3.32–4.92	51.8	56.1	+8.4
					3.39–4.09	24.0	27.1	+12.9
					8.00–11.0	30.7	26.9	−11.2
					8.50–11.5	26.2	25.5	−2.7
					8.50–11.0	25.1	23.3	−7.6
					8.85–9.35	19.7	19.6	−0.5

6	20.6	53	16.25	0.05	2.87–5.07	81.3	79.9	−1.7
					3.32–4.92	74.6	73.5	−1.5
					3.39–4.09	50.6	51.2	+1.2
					8.00–11.0	62.1	54.2	−12.7
					8.50–11.5	61.1	52.6	−13.9
					8.50–11.0	58.0	50.6	−12.8
					8.85–9.35	50.2	48.3	−3.8

7	23.3	82	16.25	0.10	2.87–5.07	88.8	93.9	+5.7
					3.32–4.92	84.3	91.8	+8.9
					3.39–4.09	68.2	84.9	+25.5
					8.00–11.0	95.8	84.9	−11.4
					8.50–11.5	96.1	84.0	−12.6
					8.50–11.0	95.4	83.3	−12.7
					8.85–9.35	90.6	83.0	−8.4

REF NO.	TEMP. °C	RELATIVE HUMIDITY %	RANGE, km	NUCLEATION DISTRIBUTION, $\frac{C}{C + M}$	SPECTRAL BAND LIMITS, MICROMETERS	ESTIMATED AVERAGE ATTENUATION %	ALTSHULER CLEAR AIR ATTENUATION %	AEROSOL EXT.%	AEROSOL ABSORPTION %
2	3.3	66	5.5	0.35	2.87–5.07	65.4	55.2	22.9	4.5
					3.32–4.92	58.9	47.1	22.3	3.0
					3.39–4.09	32.5	12.1	23.2	3.3

3	17.8	51	5.5	0.60	2.87–5.07	64.5	58.6	13.7	2.6
					3.32–4.92	56.1	49.4	13.2	1.6
					3.39–4.09	27.1	15.2	14.0	1.8
					8.0–11.00	26.9	20.5	8.1	1.9
					8.5–11.50	25.5	19.1	7.8	2.1
					8.5–11.00	23.3	16.7	7.9	1.9
					8.85–9.35	19.6	12.3	8.4	1.8

6	20.6	53	16.25	0.05	2.87–5.07	79.9	69.5	34.2	6.7
					3.32–4.92	73.5	59.6	34.4	4.6
					3.39–4.09	51.2	25.4	34.6	5.2
					8.0–11.00	54.2	36.1	28.4	6.1
					8.5–11.50	52.6	34.6	27.5	6.6
					8.5–11.00	50.6	31.3	28.0	6.1
					8.85–9.35	48.3	26.8	29.5	5.8

7	23.3	82	16.25	0.10	2.87–5.07	93.9	72.7	77.8	25.4
					3.32–4.92	91.8	63.0	77.8	18.9
					3.39–4.09	84.9	30.5	78.3	20.7
					8.0–11.00	84.9	44.4	72.8	25.2
					8.5–11.50	84.0	43.1	71.8	26.8
					8.5–11.00	83.3	39.4	72.4	25.4
					8.85–9.35	83.0	34.0	74.2	24.3

REF NO.	RANGE Km⁻¹	AIR TEMP. C	REL. HUM. %	pr. cm. H₂O	δ,2.17 km⁻¹	δ, 3.5 km⁻¹

1	5.5	1.4	47	1.37	—	—
2	5.5	3.3	66	2.2	0.091	0.062
3	5.5	17.8	51	4.18	0.042	0.031
4	5.5	25.3	73	9.4	—	—
5	16.25	11.7	41	5.2	—	—
6	16.25	20.6	53	15.1	0.038	0.038
7	16.25	23.3	82	27.7	0.046	0.047

REF NO.	TEMP °C	RELATIVE HUMIDITY %	RANGE, km	NUCLEATION DISTRIBUTION, $\frac{C}{C + M}$	SPECTRAL BANDLIMITS, MICROMETERS	Y&T MEASURED AVERAGE ATTEN %	ESTIMATED AVERAGE ATTEN %	$\frac{100 [E - (Y & T)]}{(Y & T)} %$
2	3.3	66	5.5	0.35	2.87–5.07	65.1	65.4	+0.4
					3.32–4.92	57.6	58.9	+ 2.3
					3.39–4.09	35.4	32.5	−8.2

3	17.8	51	5.5	0.60	2.87–5.07	63.0	64.5	+2.4
					3.32–4.92	51.8	56.1	+8.4
					3.39–4.09	24.0	27.1	+12.9
					8.00–11.0	30.7	26.9	−11.2
					8.50–11.5	26.2	25.5	−2.7
					8.50–11.0	25.1	23.3	−7.6
					8.85–9.35	19.7	19.6	−0.5

6	20.6	53	16.25	0.05	2.87–5.07	81.3	79.9	−1.7
					3.32–4.92	74.6	73.5	−1.5
					3.39–4.09	50.6	51.2	+1.2
					8.00–11.0	62.1	54.2	−12.7
					8.50–11.5	61.1	52.6	−13.9
					8.50–11.0	58.0	50.6	−12.8
					8.85–9.35	50.2	48.3	−3.8

7	23.3	82	16.25	0.10	2.87–5.07	88.8	93.9	+5.7
					3.32–4.92	84.3	91.8	+8.9
					3.39–4.09	68.2	84.9	+25.5
					8.00–11.0	95.8	84.9	−11.4
					8.50–11.5	96.1	84.0	−12.6
					8.50–11.0	95.4	83.3	−12.7
					8.85–9.35	90.6	83.0	−8.4

Abstract

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Equations (9)

Applied Optics